guloader | 9943588e9b315bd14f071f0dbafe5ee9ae0124c5ed10ad53b2c6a463b3920d32

Analysis

max time kernel
147s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
18/05/2023, 01:57

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General

Target

DOCUMENT.exe
Size

306KB
MD5

a814dc37ac7cc706c662194585e4d2a9
SHA1

912c6a6741476eea9621e4c71d3d7ab26ba54e5f
SHA256

49479374e667e0897b7f9a742aea8a795dce57bd2cbb0ad5e601b8b28522f0f0
SHA512

45cc9ea588eb30bd517d60dc749c15d5e4f12d66ca822eac8784e876209125570d61621880ac0206b3c852cf94a881a1c32d0613f315070ffc6f8acfc563ab2c
SSDEEP

6144:Cj20IjUUXgrZc0YuiNNKrDtzo99bYRNMZo6Ku2qP9szt76JyOk4:BNzgZ3YTTgJovbqNMHK32hJyOk4

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	DOCUMENT.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe

Loads dropped DLL 2 IoCs

pid	Process
672	DOCUMENT.exe
672	DOCUMENT.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
672	DOCUMENT.exe
3152	caspol.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 672 set thread context of 3152	672	DOCUMENT.exe	84

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\Friboligerne\Palafitte\Jotted.Kug	DOCUMENT.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
672	DOCUMENT.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 672 wrote to memory of 3152	672	DOCUMENT.exe	84
PID 672 wrote to memory of 3152	672	DOCUMENT.exe	84
PID 672 wrote to memory of 3152	672	DOCUMENT.exe	84
PID 672 wrote to memory of 3152	672	DOCUMENT.exe	84

C:\Users\Admin\AppData\Local\Temp\DOCUMENT.exe
"C:\Users\Admin\AppData\Local\Temp\DOCUMENT.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:672
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
  "C:\Users\Admin\AppData\Local\Temp\DOCUMENT.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:3152

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsc8DBF.tmp\System.dll

Filesize
11KB

MD5
c9473cb90d79a374b2ba6040ca16e45c

SHA1
ab95b54f12796dce57210d65f05124a6ed81234a

SHA256
b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352

SHA512
eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsc8DBF.tmp\System.dll

Filesize
11KB

MD5
c9473cb90d79a374b2ba6040ca16e45c

SHA1
ab95b54f12796dce57210d65f05124a6ed81234a

SHA256
b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352

SHA512
eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsc8DBF.tmp\System.dll

Filesize
11KB

MD5
c9473cb90d79a374b2ba6040ca16e45c

SHA1
ab95b54f12796dce57210d65f05124a6ed81234a

SHA256
b80a5cba69d1853ed5979b0ca0352437bf368a5cfb86cb4528edadd410e11352

SHA512
eafe7d5894622bc21f663bca4dd594392ee0f5b29270b6b56b0187093d6a3a103545464ff6398ad32d2cf15dab79b1f133218ba9ba337ddc01330b5ada804d7b

Download Submit
memory/672-143-0x0000000005210000-0x00000000081B6000-memory.dmp

Filesize
47.6MB

Download
memory/672-144-0x0000000005210000-0x00000000081B6000-memory.dmp

Filesize
47.6MB

Download
memory/3152-145-0x0000000001000000-0x0000000003FA6000-memory.dmp

Filesize
47.6MB

Download
memory/3152-146-0x0000000001000000-0x0000000003FA6000-memory.dmp

Filesize
47.6MB

Download
memory/3152-147-0x0000000000400000-0x000000000062B000-memory.dmp

Filesize
2.2MB

Download